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Teledyne PERIODIC MAINTENANCE 5.1 Heater Fan, TROUBLE SHOOTING 6.1 Preliminary, Model 212R

Models: 212R

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5.PERIODIC MAINTENANCE

Thermal Conductivity Analyzer	Model 212R

Duetothedelicatebalanceofthethermalconductivitycellemployedinthe analyzer,exposuretotheatmosphereinanuncontrolledtemperatureenviron- ment is undesirable. After extended shutdown periods many days of operation may be required for the analyzer to re-stabilize.

5.PERIODIC MAINTENANCE

5.1Heater Fan.

Theheaterfanistheonlycomponentwithintheanalyzerthatrequires periodic attention. Whenever the reference gas is replaced the motor bear- ings will require a few drops of light machine oil. Since oiling the fan motor necessitatesopeningtheinnerdooroftheanalyzer,theinstrumentwillrequirethe necessary temperature equilibrating time after the door is closed. With zero gas flowing be sure that the analyzer has stabilized on the Range #1 position before re-standardizationisattempted.

6.TROUBLE SHOOTING

6.1Preliminary.

If the analyzer is suspected of incorrect operation, as a preliminary to evaluation, always arrange the input manifold so that zero gas is flowing through the sample path of the analyzer. Never attempt to evaluate the performance of the instrument with sample gas flowing.

Analysisbythermalconductivityisnonspecificinnature. Athermalcon- ductivityanalyzerwiththefinerangesensitivityoftheModel212Rwill respond tomanyinfluencingfactorsotherthanthecomponentofinterest;particularly when operated at Range #1 sensitivity.

It is necessary, therefore, to eliminate as many external variables as possible if the performance of the analyzer is to be assessed. Programming the analyzer for zero gas places both paths of the measuring cell on relatively reliable cylinder gas sources.

6.1.1Electrical Checks.

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Teledyne PERIODIC MAINTENANCE 5.1 Heater Fan, TROUBLE SHOOTING 6.1 Preliminary, Electrical Checks, Model 212R

Contents

Model 212R Thermal Conductivity AnalyzerTeledyne Analytical Instruments MODEL 212RThermal Conductivity Analyzer WarrantyModel 212R Teledyne Analytical InstrumentsInstallation Table of ContentsIntroduction StartupTroubleshooting Periodic MaintenanceCalibration Data AppendixThe Model 212R compares the thermal conductivity of a sample gas to that of a fixed composition reference gas and produces an electrical output signal that is calibrated to represent the difference between the two gases 1. INTRODUCTION 1.1 Method of AnalysisThermal Conductivity Analyzer Model 212R1.2 Sensitivity 1.5 Physical Configuration1.3 Stability 1.4 Special Consideration2.2 Electrical Requirements and Connections 2. INSTALLATION 2.1 LocationThermal Conductivity Analyzer Model 212R2.2.2 Signal Output 2.2.1 Primary Power2.2.3 Regulating Transformer Thermal Conductivity Analyzer2.3 Gas Requirements and Connections 2.2.4. Completion and InspectionThermal Conductivity Analyzer Model 212R2.3.2 Zero Gas 2.3.1 Reference Gas2.3.3 Span Gas Thermal Conductivity Analyzer2.3.6 Interconnecting Lines 2.3.4 Installation of Cylinder Supplies2.3.5 Sample Pressure Thermal Conductivity Analyzer3.0 STARTUP 3.1 Preliminary 2.3.7 Vent LinesThermal Conductivity Analyzer Model 212R3.3 Zero Gas Flow 3.2 Reference Gas Flow3.4 Warmup 3.5 Zero Standardization3.7 Bypass 3.6 Span StandardizationThermal Conductivity Analyzer Model 212R4. ROUTINE OPERATION 4.1 Flowrates 3.8Sample ModeThermal Conductivity Analyzer Model 212R4.3 Standardization 4.2 Supporting Gas SuppliesThermal Conductivity Analyzer Model 212R6. TROUBLE SHOOTING 6.1 Preliminary 5. PERIODIC MAINTENANCE 5.1 Heater Fan6.1.1 Electrical Checks Thermal Conductivity Analyzer6.1.3 Summary of Preliminary Checks 6.1.2 Sampling System Checks6.2 Loss of Zero Control Thermal Conductivity AnalyzerThermal Conductivity Analyzer 6.2.1 Dynamic Balance ProcedureModel 212R 2 Set the ZERO potentiometer to5 Using a screwdriver that has a shaft diameter of 1/8” and a shaft length of at least 6”, turn the “Reactive” balance adjustment all the way counterclockwise CCW until the potentiometer stop point is reached. Turn the adjustment back clockwise CW 5 full turns to center the adjustment 6.3 Correct OperationThermal Conductivity Analyzer Model 212R6.4.1 Analyzer Leak 6.4 Incorrect OperationThermal Conductivity Analyzer Model 212RCheckaspreviouslystated,theanalyzersentiresamplingsystemhasbeen checked under pressure with a leak detector. However, if the external system checksoutandtheinstrumentisdisplayingalargediurnaloruni-directionaldrift, the interior sampling system should be checked for leaks. Do not open the analyzerinnerdoor. Usethefollowingprocedure 6.4.2 Temperature Control CheckThermal Conductivity Analyzer Model 212RModel 212R Thermal Conductivity Analyzer5 points outlined in section Teledyne Analytical InstrumentsRangeSwitchPosition#1 7.0 CALIBRATION DATA FOR MODEL 212R SERIAL NUMBER 7.1 RangesRange Switch Position #2 Range Switch Position #37.3 Span Setting 7.4 Recommended Accessory Gases 7.2 Output Signal7.4.1 Reference Gas 7.4.2 Zero Gas7.4.3 Span Gas RECOMMENDED SPARE PARTS LISTThermal Conductivity Analyzer Model 212RDrawing List Replacement Parts Order InformationTELEDYNE Analytical Instruments Thermal Conductivity AnalyzerPower APPENDIX SpecificationsThermal Conductivity Analyzer Model 212R